Fluid-operated motor



C. L. HEISLER.

FLUID OPERATED MOTOR.

APPtlCATlON FILED FEB. 24. 1920.

Pawnted Sept. 21,1920.

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CHARLES L. HEISLEBI, 0F SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

FLUID-OPERATED Moron.

Specification of Letters Patent.

Patented Sept. 21, 1920.

Application filed. February 24, 1920. Serial No 360,939.

To allwhomitmag concern."

Be it known that I, CHARLES L. HEISLER, a citizen of the United States,residing at Schenectady, in the county of Schenectady, State of NewYork, have invented certain new and useful Improvements inFluid-Operated Motors, of which-the following is a specification.

The present invention relates to fluid operated motors such as used tooperate the valve gear of engines, for example, elastic fluid turbines,for regulating the admission operated motor of this character.

of operating fluid to the engines, and the object of my invention is toprovide an improved structure and arrangement in a fluid For aconsideration of what I believe to be novel and my invention, attentionis directed to the accompanying description and the claims appendedthereto. t

In the drawing, the figure is a sectional view of a fluid actuated motorembodying my invention, only as much of the engine parts being indicatedas is necessary for an understanding of the invention.

Referring to the drawing, 5 indicates the cylinder of the fluid operatedmotor, and 6 the piston to which is connected a stem 7 which operatesthe valve gear of the turbine or other engine for controlling theadmission of elastic fluid thereto. In the present instance, stem 7 isprovided at its outer end with a rack 8 which engages a pinion 9 on ashaft 10 from which shaft the admission valve or valves of a turbine orother engine are operated by means of cams or otherwise.

Valve gear arrangements of this character are well known and need nodetailed deare passages connecting the pilot valve casing to cylinder 5on opposite sides of pistori 6. The pilot valve stem 17 is connected atits outer end to a floating lever 18 which lever is connected by a rod19 and bell crank lever 20 to a speed governor 21. Speed gover'nor 21 isthe governor of an engine, the valve gear of which is operated by thefluid actuated motor illustrated, and is used to driven from the engineshaft.

control the speed of theengine as is well understood. Floating lever 18is connected at one end to an arm 22 which projects from stem 7.- f

The arrangement so far described forms an ordinary and well known typeof fluid actuated motor arrangement for regulating the valve gear of anengine by means of a speed governor, the connections including afollow-up device to prevent over-travel of the valve gear. The operationof such a fluid actuated motor is well understood and may be brieflydescribed as follows:

In case of increase in speed, the balls of governor 21 will fly out,thereby moving pilot valve 12 toward the right and connecting inletconduit 13 with passage 15 and exhaust conduit 14 with passage 16. As aresult actuating fluid for the motor will be admitted to the left handside of the iston 6 and exhausted from the right hand side causing it tomove in a direction to close the Valve means which is actuated-by rack8. In case of a decrease in speed of the engine,

the same action takes place, except in the ter, it is customary toutilize as motive fluid 4 for the fluid actuated motor, oil from theforced feed lubricating system for the engine, such oil being suppliedby a pump However, the fluid actuated motor requires considerably morepressure for its operation than is required for lubricating purposes. Asa result, it has been the custom ,to provide a pump which would maintaina pressure in the lubricating system sufficiently high for use in thefluid-actuated motor for the valve gear although such pressure was muchhigher than that actually required for lubrieating purposes. This hasrepresented a considerable waste of energy since but comparativelylittle fluid isused in the fluidactuated motor. I

More particularly, the object of my invention is to overcome the abovedifliculty and to this end I provide an arrangement of apparatus wherebythe fluid-actuated motor which is operated from the forced feedlubricating system may be operated with fluid of a very much lowerpressure than heretofore, z'. 6., a pressure no higher than thatactually required for the lubricating system, while at the same time,ample motive power is provided for operating the valve gear. Accordinglyif provide in connection with the usual fluid-actuated motor which isconnected to the lubricating s stem, a second fluid-actuated motor whichterm a booster motor and which is operated by high pressure elasticfluid such as is supplied to operate the engine or turbine. 'llhisbooster motor is arranged in such manner that it will assist the regularhydraulic motor in operating the valve gear.

24 indicates a cylinder in which is a piston 25 provided with a stem 26which is connected to piston 6, the two cylinders 5 and 2% beingarranged in axial alinement. Connected to cylinder 24 is asmallercylinder 27 in which is a pilot valve 27A. The'admission conduitfor pilot valve 2'? is indicated at 28 and the discharge conduit at, 29.The pilot valve casing 27 is connectedto cylinder 24 on the two sides ofpiston 25 by passages 30 and 31. The stem 32 of pilot valve 27 isconnected to a fluid actuated abutment 33 which is shown in the form ofa piston which moves in the cylinder 34:. One side of abutment 33 issubjected to the pressure in cylinder 5 on one side of piston 6 througha passage 35, and the other side of the abutment is subjected to thepressure on the other side of the piston 6 through a passage 36'Abutment 33 is normally maintained in an intermediate position incylinder 34 by means of springs 37 which at opposite ends engage spacedcollars 38 loosely mounted on pilot valve stem 32, and normally heldagainst shoulders 39 which are fixed on stem 32. The loose collars 38are positioned by means of spaced stops 4:0 and 41.

Assume that the engine is operating and the various parts are in thepositions shown in the drawing. If now speed governor 21 moves pilotvalve 12 in one direction or the other, it will result in admittingfluid pressure to one side of piston 6 and permitting it to exhaust fromthe other side of piston 6 in the usual manner. As aresult the pressureson opposite sides of abutment 33 become unbalanced and consequentlyabutment 33 will be moved in one direction or the other, thereby movingpilot valve 27 to connect inlet conduit 28 to one side of piston 25 anddischarge conduit 29 to the other side, the connections being such thatpiston 25 will move in a direction to assist the movement of piston 6.For example, assuming that pilot valve 12 is moved to connect inletconduit 13 to passage 15, discharge conduit 14: to passage 16, then thepressure will be increased on the left hand side of piston 6 anddecreased on the right hand sidethereof. As a result fluid actuatedabutment 33 will be forced toward the left connecting inlet conduit 28through passage 30 to the left hand side of piston 25 and dischargeconduit 29 to the right hand side,

whereupon actuating fluid, as elastic fluid from the engine, will beadmitted to the left hand end of cylinder 24 so that piston 25 will movetoward the right and in a direction to assist the movement of piston 6.As soon as the pressures on opposite sides of piston 6 become balanced,then abutment 33 will be brought back to its intermediate position bysprings 37. As is clear, when abutment 33 moves to the left, left handcollar 38 will be held from movement by the stop 4C0, while the righthand collar 38 will be forced toward the left by shoulder 39 to putspring 37 under compression, the stem 32 at such time sliding throughleft hand collar 38.

With the above described arrangement,

therefore, it will be seen that I utilize fluid of comparatively lovipressure, such as would normally be supplied through the force feedlubricating system of an engine, in the main fluid actuated motor, whileat the same time i am'enabled to obtain ample power for operating thevalve gear by utilizing in series with the fluid-actuated motor, abooster motor which may be operated by high pressure fluid such as theelastic fluid used in the engine, for example, steam.

In accordance with the provisions of the patent statutes, l havedescribed the principle of operation of my invention, together with theapparatus which ll now consider to represent the best embodimentthereof, but I desire to have it understood that the apparatus shown isonly illustrative and that the invention may be carried out by othermeans.

What ll claim as new and desire to secure by Letters Patent of theUnited States, is

1. in an apparatus of the character described, the combination of afluid actuated motor having a pilot valve, a second fluid actuated motorhaving its moving element connected to the moving element of thefirst-named motor, and means controlled by the fluid pressure of thefirst-named motor for admitting fluid pressure to the secondnamed motor.

2. In an apparatus of the character described, the combination of afluid actuated motor having a pilot valve a second fluid actuated motorhaving its moving element connected to the moving element of thefirst-named motor, and valve means controlled by the pressure of thefirst-named motor for admitting fluid pressure to the second-namedmotor.

3. In combination, a fluid actuated motor comprising a cylinder, apiston therein, and a pilot valve for controlling the passage ofactuating fluid to the cylinder, 2. second fluid actuated motorcomprising a cylinder, a piston and a pilot valve for controlling thepassage of actuating fluid to such cylinder,

fluid actuated motor comprising a cylinder,

a piston and a pilot valve for controlling the passage of actuatingfluid to such cylinder, means connecting said two pistons together, amovable abutment, a cylinder in 15 which it moves, conduits connectingopposite ends of the last named cylinder to opposite ends of thecylinder of the first-named motor, a stem which connects said abutmentto the pilot valve of the second-named 20 motor, and means for normallymaintain ing said abutment in a central-position in its cylinder sothepilot valve of the secondnamed motor is closed In Witness whereof, Ihave hereunto set 25 my hand this 20th day of February, 1920.

CHAR-LES L. HEISLER.

